# header_lines : 150
#
# ------------------------------------------------------------->>>>
# DATA SET NAME
#
# dataset_name: h2_bme_surface-flask_1_ccgg_event
#
# ------------------------------------------------------------->>>>
# DESCRIPTION
#
# dataset_description: Atmospheric Hydrogen Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 2009-2021
#
# ------------------------------------------------------------->>>>
# CITATION
#
# dataset_citation: Petron, G., Crotwell, A., Crotwell, M., Kitzis, D., Madronich, M., Mefford, T., Moglia, E., Mund, J., Neff, D., Thoning, K., & Wolter, S. (2023). Atmospheric Hydrogen Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 2009-2021 [Data set]. NOAA GML CCGG Division. Version: 2023-07-05, https://doi.org/10.15138/WP0W-EZ08
#
# ------------------------------------------------------------->>>>
# FAIR USE POLICY
#
# dataset_fair_use: These data are made freely available to the public and the scientific community in the belief that their wide dissemination will lead to greater understanding and new scientific insights. The availability of these data does not constitute publication of the data.  NOAA relies on the ethics and integrity of the user to ensure that GML receives fair credit for their work.  If the data are obtained for potential use in a publication or presentation, GML should be informed at the outset of the nature of this work. If the GML data are essential to the work, or if an important result or conclusion depends on the GML data, co-authorship may be appropriate.  This should be discussed at an early stage in the work.  Manuscripts using the GML data should be sent to GML for review before they are submitted for publication so we can ensure that the quality and limitations of the data are accurately represented.
#
# ------------------------------------------------------------->>>>
# WARNING
#
# dataset_warning: Every effort is made to produce the most accurate and precise measurements possible.  However, we reserve the right to make corrections to the data based on recalibration of standard gases or for other reasons deemed scientifically justified.  We are not responsible for results and conclusions based on use of these data without regard to this warning.
#
# ------------------------------------------------------------->>>>
# GLOBAL ATTRIBUTES
#
# site_code : BME
# site_name : St. Davids Head, Bermuda
# site_country : United Kingdom
# site_country_flag : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNKG0001.GIF
# site_latitude : 32.368
# site_longitude : -64.6476
# site_elevation : 12.0
# site_elevation_unit : masl
# site_position_comment : This is the nominal location of the site. The sampling location at many sites has changed over time, and we report here the most recent nominal location. The actual sampling location for each observation is not necessarily the site location. The sampling locations for each observation are reported in the latitude, longitude, and altitude variables.
# site_utc2lst : -4.0
# site_utc2lst_comment : Add 'site_utc2lst' hours to convert a time stamp in UTC (Coordinated Universal Time) to LST (Local Standard Time).
# dataset_creation_date : 2023-07-05T13:00:15.051725
# dataset_num : 10
# dataset_name : h2_bme_surface-flask_1_ccgg_event
# dataset_parameter : h2
# dataset_parameter_name : Molecular Hydrogen
# dataset_parameter_industrial_name : Molecular Hydrogen
# dataset_project : surface-flask
# dataset_platform : fixed
# dataset_selection : event
# dataset_selection_tag : event
# dataset_comment : For more information about these data, please see https://gml.noaa.gov/aftp/data/trace_gases/h2/flask/README_h2_surface-flask_ccgg.html
# dataset_calibration_scale : H2_X2009
# dataset_start_date : 2009-11-18T16:15:00Z
# dataset_stop_date : 2010-01-25T13:26:00Z
# dataset_reciprocity : Use of these data implies an agreement to reciprocate. Laboratories making similar measurements agree to make their own data available to the general public and to the scientific community in an equally complete and easily accessible form. Modelers are encouraged to make available to the community, upon request, their own tools used in the interpretation of the GML data, namely well documented model code, transport fields, and additional information necessary for other scientists to repeat the work and to run modified versions. Model availability includes collaborative support for new users of the models.
# dataset_usage_description : Please cite the product's citation when using data from this dataset. Relevant literature references for this dataset are listed below for convenience.
# dataset_reference_total_listed : 2
# dataset_reference_1_name : Novelli, P.C., K.A. Masarie, and P.M. Lang, Molecular hydrogen in the  troposhere: Global distributions and budget,  J. Geophys Res., 104, 30,427-30,444, 1999.
# dataset_reference_2_name : Novelli, P.C., Crotwell, A.M., and Hall, B.D, Application of Gas Chromatography with a Pulsed Discharge Helium Ionization Detector for Measurements of Molecular Hydrogen in the Atmosphere, Environ. Sci. Technol. 2009, 43, 2431-2436.
# dataset_contribution : These data are provided by NOAA. Principal investigators include Gabrielle Petron (NOAA).
# lab_total_listed : 1
# lab_1_number : 1
# lab_1_abbr : NOAA
# lab_1_name : NOAA Global Monitoring Laboratory
# lab_1_address1 : 325 Broadway
# lab_1_address2 : NOAA R/GML-1
# lab_1_address3 : Boulder, CO 80305-3328
# lab_1_country : United States
# lab_1_url : https://gml.noaa.gov/ccgg/
# lab_1_parameter : Lab has contributed measurements for: h2
# lab_1_country_flag : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/flags/UNST0001.GIF
# lab_1_logo : https://gml.noaa.gov/webdata/ccgg/ObsPack/images/logos/noaa_medium.png
# lab_1_ongoing_atmospheric_air_comparison : T
# provider_total_listed : 1
# provider_1_name : Gabrielle Petron
# provider_1_address1 : NOAA GML
# provider_1_address2 : 325 Broadway R/GML-1
# provider_1_address3 : Boulder, CO 80305-3328
# provider_1_country : United  States
# provider_1_affiliation : National Oceanic and Atmospheric Administration
# provider_1_email : Gabrielle.Petron@noaa.gov
# provider_1_tel : (720) 295-0145
# provider_1_parameter : Provider has contributed measurements for: h2
# ------------------------------------------------------------->>>>
# VARIABLE ATTRIBUTES
#
# site_code:long_name : site_name_abbreviation.
# site_code:comment : Site code is an abbreviation for the sampling site name.
# time_components:_FillValue : -9
# time_components:long_name : integer_components_of_UTC_date/time
# time_components:order : year, month, day, hour, minute, second
# time_components:comment : Calendar time components as integers. Times and dates are UTC. Time-averaged values are reported at the start of the averaging interval.
# datetime:long_name : air_sample_date_and_time_in_UTC
# datetime:comment : Air sample date and time in UTC ISO 8601 format. Time-averaged values are reported at the start of the averaging interval.
# time_decimal:_FillValue : -999.999
# time_decimal:long_name : sample_decimal_year_in_UTC
# time_decimal:comment : decimal year in UTC. Time-averaged values are reported at the start of the averaging interval.
# air_sample_container_id:long_name : Air_Sample_Container_ID
# air_sample_container_id:comment : ID of air sample container. See provider_comment if available.
# value:_FillValue : -999.999
# value:long_name : measured_mole_fraction_of_trace_gas_in_dry_air
# value:units : nanomol mol-1
# value:comment : Mole fraction reported in units of nanomol mol-1 (10-9 mol per mol of dry air); abbreviated as ppb (parts per billion).
# value:scale_comment : H2_X2009
# value_unc:_FillValue : -999.999
# value_unc:long_name : estimated_uncertainty_in_reported_value
# value_unc:units : nanomol mol-1
# value_unc:comment : This is the estimated uncertainty of the reported value. See provider_comment if available.
# latitude:_FillValue : -999.999
# latitude:standard_name : latitude
# latitude:long_name : sample_latitude_in_decimal_degrees
# latitude:units : degrees_north
# latitude:comment : Latitude at which air sample was collected.
# longitude:_FillValue : -999.999
# longitude:standard_name : longitude
# longitude:long_name : sample_longitude_in_decimal_degrees
# longitude:units : degrees_east
# longitude:comment : Longitude at which air sample was collected using a range of -180 degrees to +180 degrees.
# altitude:_FillValue : -999.999
# altitude:standard_name : altitude
# altitude:long_name : sample_altitude_in_meters_above_sea_level
# altitude:units : m
# altitude:comment : Altitude (in meters above sea level). See provider_comment if available.
# altitude:provider_comment : Altitude for this dataset is the sum of surface elevation (masl) and sample intake height (magl).
# elevation:_FillValue : -999.999
# elevation:standard_name : elevation
# elevation:long_name : surface_elevation_in_meters_above_sea_level
# elevation:units : m
# elevation:comment : Surface elevation in meters above sea level. See provider_comment if available.
# intake_height:_FillValue : -999.999
# intake_height:long_name : sample_intake_height_in_meters_above_ground_level
# intake_height:units : m
# intake_height:comment : Sample intake height in meters above ground level (magl). See provider_comment if available.
# method:long_name : air_sample_collection_method
# method:comment : Air sample collection method. See provider_comment if available.
# method:provider_comment : A single-character code is used to identify the sample collection method. The codes are: P - Sample collected using a portable, battery powered pumping unit. Two flasks are connected in series, flushed with air, and then pressurized to 1.2 - 1.5 times ambient pressure. D - Similar to P but the air passes through a condenser cooled to about 5 deg C to partially dry the sample. G - Similar to D but with a gold-plated condenser. T - Evacuated flask filled by opening an O-ring sealed stopcock. S - Flasks filled at NOAA GML observatories by sampling air from the in situ CO2 measurement air intake system. N - Before 1981, flasks filled using a hand-held aspirator bulb. After 1981, flasks filled using a pump different from those used in method P, D, or G. F - Five liter evacuated flasks filled by opening a ground glass, greased stopcock
# event_number:long_name : Unique_Air_Sample_Event_Number
# event_number:comment : Identifies each discrete air sample collected at some time and location with a unique sample event number.  The event number (reported as a string) can be used to relate measurements of different trace gases and isotopes from the same sample.
# instrument:long_name : instrument_ID_to_detect_atmospheric_parameter
# instrument:comment : Instrument ID used to detect atmospheric parameter. See provider_comment if available.
# analysis_datetime:long_name : air_sample_measurement_date_and_time_in_LT
# analysis_datetime:comment : Air sample measurement date and time in LT. See provider_comment if available.
# qcflag:long_name : quality_control_flag
# qcflag:comment : This quality control flag is provided by the contributing PIs. See provider_comment if available.
# qcflag:provider_comment : This is the NOAA 3-character quality control flag.  Column 1 is the REJECTION flag. An alphanumeric other than a period (.) in the FIRST column indicates a sample with obvious problems during collection or analysis. This measurement should not be interpreted. Column 2 is the SELECTION flag. An alphanumeric other than a period (.) in the SECOND column indicates a sample that is likely valid but does not meet selection criteria determined by the goals of a particular investigation. For example, it might not have been obtained during 'background' conditions.  Column 3 is the INFORMATION flag. An alphanumeric other than a period (.) in the THIRD column provides additional information about the collection or analysis of the sample. A P in the 3rd column of the QC flag indicates the measurement result is preliminary and has not yet been carefully examined by the PI.  The P flag is removed once the quality of the measurement has been determined.
#
# VARIABLE ORDER
#
site_code year month day hour minute second datetime time_decimal air_sample_container_id value value_unc latitude longitude altitude elevation intake_height method event_number instrument analysis_datetime qcflag
BME 2009 11 18 16 15 0 2009-11-18T16:15:00Z 2009.8813070776255 5037-99 503.42 1.985 32.368 -64.6476 17.0 12.0 5.0 P 287972 H8 2010-01-05T11:49:00 ...
BME 2009 11 18 16 15 0 2009-11-18T16:15:00Z 2009.8813070776255 5038-99 503.55 1.985 32.368 -64.6476 17.0 12.0 5.0 P 287973 H8 2010-01-05T12:05:00 ...
BME 2009 12 2 20 15 0 2009-12-02T20:15:00Z 2009.9201198630137 1185-99 502.85 1.985 32.368 -64.6476 17.0 12.0 5.0 P 287970 H8 2010-01-05T12:51:00 ...
BME 2009 12 2 20 15 0 2009-12-02T20:15:00Z 2009.9201198630137 1186-99 502.74 1.985 32.368 -64.6476 17.0 12.0 5.0 P 287971 H8 2010-01-05T13:06:00 ...
BME 2010 1 25 13 26 0 2010-01-25T13:26:00Z 2010.067286910198 4253-99 512.07 1.86 32.368 -64.6476 17.0 12.0 5.0 P 293352 H11 2010-04-07T14:40:00 ...
BME 2010 1 25 13 26 0 2010-01-25T13:26:00Z 2010.067286910198 4254-99 516.06 1.86 32.368 -64.6476 17.0 12.0 5.0 P 293353 H11 2010-04-07T14:55:00 ...